Phil_T

As above there is something seriously wrong with the car so I will explain what its doing. Sorry its a long one!

It has 4 new tyres on which are Michelin Pilot Super Sports which where fitted in December & I would have a guess at the car has done 2000 miles if that since they were fitted.

Note this is even on a straight and worse going round bends. AND the Tyre pressure monitor has come on twice recently and I have checked pressures & reset them but it has come on again.

In s+ the traction light is coming on in 1st and 2nd seriously cutting the power even in the dry. It never used to do this, It used to be fine even in the dry

In s+ and sport mode turned on which normally lets a little bit of slip, The car is pulling all over the road like its on ice with 1000bhp in the dry (Seriously grabbing onto the steering wheel fighting to keep it straight). It never used to do this, All it used to do was like normal allow a tiny bit of slip but no wheel spin and the car would drive straight

It feels pretty dangerous to be honest and I always used to have fun abit round the bends but I tried it while it was like this and it was not easy to control at all.

I have also noticed the front end seems like it was gone light & also the car even in comfort in the dry when it sets off in 2nd gear traction kicks in this is on a straight and worse when setting off on a bend.

I have put the right pressure in the tyres as advised in the fuel cap too. They are also standard tyre sizes for the 19" optional wheels.

I hope you can help as I have no clue what could be up with the car and I am normally pretty good with cars. I remember having a little bit of wheel spin on the yoko tyres and the car didnt feel as fast which I put down to needing new tyres and it has been worse like above since.

It was fine for 2.5 years since I have owned it from new (remap since new) till just before symptoms started before the tyre change.

This also maybe relevant, When it was on the yokos I had a blow out on the rear drivers side at only 20 mph and pulled over straight away which I admit was due to myself as I did not check the inside of the rear tyres which had both worn down to the canverse, Part of the tread came away from the tyre and flapped about in the wheel well. (This was over 1 year ago)

Also 2 weeks ago I took the car for a good drive and the tyre pressure monitor came up with check pressure, I was in the middle of no where so parked on a flat surface and all the tyres looked like they were inflated, the car drove fine for 1 hour then 5 minutes from home there was a lot of road noise and the car felt like the tyre was coming off so I pulled over straight away into a petrol station and the rear drivers tyre had gone completely flat! I tried to put air in and it wouldn't hold pressure. I swapped it to the spare and drove home and checked the wheel/tyre. The tyre was ripped which was because it was flat when I drove into the petrol station and there was a cut in part of the tread which may have been the cause for it going flat. I took the wheel to a wheel repair place and they took the tyre off to inspect the wheel which they said looked fine apart from the inner wheel did move slightly on the wheel weight machine but he said that wasn't enough to cause any problems. To be safe I bought a brand new rear wheel and tyre but I still have the problems.

Badmeat

Check all of your bushings and suspension connections. Get the car on a lift and use a pry bar to check for play and inspect for missing/broken bolts. It definitely sounds like something is loose. I just had the K-MAC rear bushing kit installed and one of the toe-arms was loose post-install, so I felt some shifting around in both straight lines and cornering. Torqued it to spec and re-aligned....all is well now.

Hope you get it squared away quickly and cheaply!

Merc63

Take it ack to the tire shop

Phil_T

Because car is under warranty they dont want to touch rest of car but they did check all the wheels tyres over.

I dont want to take it straight to Merc just yet as most are pretty useless at solving problems. I plan to take it to an Merc specialist that also does alot of supercharged c63 etc but I wanted to see what people may think it could be.

zcct04

It sounds like you've had a leaking tire for several months. You mentioned that the tire pressure monitor has come on a couple times since the new tires were mounted and that you have "reset" it. Does that mean you just reset the monitor, or that you checked each tire and aired up the low one(s)? If the latter, how many were low and how low were they? Having one or more tires that are very low will certainly impact handling (although usually not to quite the degree you have described).

Based on your recent flat tire experience, it also sounds like you need to begin trusting the tire pressure monitoring system. Having to replace both wheel and tire was a painful and avoidable expense. In the states, the FL cars have a screen that shows the actual pressure in each of the four tires. Is that not the case for the C63 in the UK?

Wobble64

A lot of the symptoms you describe could be also related to alignment being way off (in addition to something being loose or disconnected as mentioned above). I would take the car to a shop to check the suspension and alignment - you would probably already have the problem identified and solved......
We are all just speculating with no real data.

Phil_T

I checked pressures each time and they were all fine, the car only comes up with check pressures and does not tell me the numbers or show me which tyre.


The tyre replacement had to be done as it ripped the sidewall when it was flat rolling into the garage.



Thanks, I will take it into the dealer for them to look at but like you said something does feel loose as the car feels like its moving even at comfort speed. I first started to notice things felt strange when I took the car out for a good drive in the open road that I use, I took the bend at the same speed I always do and the car felt really light and unsafe going round the bend like it was disconnected from the car (it didn't feel planted & similar to extreme bodyroll on cheap cars)

drewsands

Might be the bead the tire against the rim. Bring it to a Benz specialist. One that is obsessed with benz.

medamullet

sway bar come lose? or like stated above, bad bushings? your car seems pretty new to be having those kind of problems. gl

riteoff

Age of tires checked? If it's under warranty why not have the dealer check it out? Check wheel nuts torque? Check tire orientation(outside and direction?

medamullet

I am going to go check my alignment as well. I just took my snow tires off. brand new 4 months ago and the inside of the passenger tire is completely bald for the first 3/4 inches. Sounds a bit like yours....

ItalianJoe1

So you added one new tire and the car feels sloppy now? Check alignment, but i've seen that happen on cars like this that run a lot of camber when you put on a new set. I'd say give it a couple hundred miles to settle in if the alignment is within spec. Or try running the pressures slightly lower than stock.

The only other thing could be an intermittently errant wheel speed sensor, causing false wheel spin signals causing the ESP to overreact to a condition that isn't really happening. If you had a tire come apart and flail around in the wheel well, it could have damaged the wiring or sensor on that wheel, which could cause the issue.

Phil_T

Right guys need help again, they have checked all the car over and can find nothing wrong with it, yet admit the problem with how the car handles is there. They have said that my tyres are not MO spec which they think could be the problem.

They dont make Super sports in MO spec, loads of other people have fitted these to their c63 but had no issues. Also the new c63/c63s has the same times fitted but 265 rears.

Phil_T

No, the problem started on the old conti tyres, since changing to 4 brand new michelin pss the problem seems to have got worse, At first I thought it was because they were brand new tyres but after 4 months of use they have not got better and the tyre pressure monitor has come on a few times, esp always kicking in even in the dry, car feels very unsafe like its moving everywhere, steering feels very light, seems like you have to apply more steering to turn, also testing again earlier last week I am sure it lit the front tyres up in 3rd gear high revs which it should never do. I have also noticed the esp seems to cut in more when cornering.

Merc63

Return the tires for something, they will take them back. Say it makes the car dangerous.

INS1GNIA

I know not ideal but you could always replace all the tpms sensors.

Phil_T

Merc said they ar so certain its because the tyres are not MO spec they will order a new full set of contis MO spec just to let me try on the car to prove the point. They said they wont work on the car any more if the tyres solve the problem when we take it out for a test drive. It goes back next Tuesday.

Ive messaged my tyre guy what Merc said to see what he says.

Phil_T

Merc have said car is showing no fault codes on computer, tpm sensors work off ABS sensors so they wont replace any of them if computer shows no fault codes.

INS1GNIA

I meant for you to physically do it or have an actual tire place do it and not rely on Mercedes. Hopefully it will get figured out though.

zcct04

What???
Agree that lighting up the FRONT tyres is something that a C63 should never do.
If this is happening very often, you may not be driving a C63 . . .

Phil_T

It felt like front tyres were spining/lost grip in 3rd gear going up hill, in the dry between 4-6k revs

TAILWAG

You have been driving the car for 4 months like this?
That is crazy.
I had a very similar situation in my 911 when I switched from PS2s to Ventus which everyone seemed to be happy about. The car was UNDRIVEABLE. I called DDT where I got them from and without hesitation, they said they would take them back. I had put about 300 miles on them, and they still gave me 100% money back and even paid for the freight.
On porsche cars, having VERY stiff sidewalls in the rear tires is a must - otherwise the car will feel extremely unstable.
I am curious to see if that is in fact the problem w/your car, but I have tried numerous types of tires on my C63 and never has it ever felt unsafe/unstable...
Good luck man - I bet it can be frustrating.

Phil_T

I know it seems along time but at first it was just abit of tyre spin from setting off so I put it down to the tyres being brand new, its a 2nd car so doesnt get used much apart from short journeys. I began to notice it after I took the car out for a good run and it seemed strange, so I took it out a second time and thats when I noticed it really wasnt right.

Mb have been good with me since owning the car from new and their offer to try new tyres without buying them is good of them, I hope it is the problem but will have to wait a week to see.

Phil_T

UPDATE Merc was right it was tyres (They have been great with me and one of the head technicians was out with me after we sorted the car just talking about these cars), Michelin PSS do not work on the C63 as the sidewalls are too soft.

I don't know how other people do not notice this on their car who have fitted these, Maybe its different for people who have fitted different wheels and tyre sizes but the 19" standard tyre sizes do not work on this car.

Car now on conti's and has fixed it and sticks to the road like it should, no more tps monitor coming up either.

So another £700 down in new tyres and 4 Michelin PSS tyres with 2000 miles on them and 1mm of tread only come off them sat at home.

medamullet

Nice find. I love reading "problem solved" threads.